Pipe coupling
First Claim
1. A pipe coupling for connecting together two pipes in a fluid-tight manner, the coupling comprising:
- a tubular casing concentrically surrounding mutually opposing end portions of the pipes;
a tubular sealing sleeve disposed radially between the pipes and the tubular casing, the sealing sleeve having at least one circumferential slot disposed in a radially outer surface thereof;
tensioning means for tightening the tubular casing about the sealing sleeve; and
gripping ring means for preventing the pipes from being pushed apart axially when subjected to large internal pressures, the gripping ring means being positioned within the at least one slot and having a plurality of radially inwardly projecting gripping teeth whereby tightening the tensioning means causes the sealing sleeve to be pressed into sealing engagement with the pipe ends, and causes the gripping teeth to penetrate through a radially inner surface portion of the sealing sleeve which is disposed radially inwardly from an inner end of the at least one slot to engage a radially outer surface of one of the pipes.
1 Assignment
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Accused Products
Abstract
A pipe coupling for connecting together two plain-ended pipes in a fluid-tight manner comprises an outer tubular casing, an inner tubular casing and a tubular sealing sleeve. The sealing sleeve has two sets of inwardly projecting ribs which, in use, are pressed into sealing engagement with the respective ends of the pipes. The inner and outer casings are longitudinally split and tensioning screws on the outer casing can be tightened to tighten the outer casing around the inner casing and the sealing sleeve. Frustoconical slots in the outer surfaces of the sealing sleeves receive frustoconical gripping rings which have gripping teeth on the inner sides which bite into the pipe surfaces to secure the pipes against axial displacement.
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Citations
19 Claims
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1. A pipe coupling for connecting together two pipes in a fluid-tight manner, the coupling comprising:
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a tubular casing concentrically surrounding mutually opposing end portions of the pipes; a tubular sealing sleeve disposed radially between the pipes and the tubular casing, the sealing sleeve having at least one circumferential slot disposed in a radially outer surface thereof; tensioning means for tightening the tubular casing about the sealing sleeve; and gripping ring means for preventing the pipes from being pushed apart axially when subjected to large internal pressures, the gripping ring means being positioned within the at least one slot and having a plurality of radially inwardly projecting gripping teeth whereby tightening the tensioning means causes the sealing sleeve to be pressed into sealing engagement with the pipe ends, and causes the gripping teeth to penetrate through a radially inner surface portion of the sealing sleeve which is disposed radially inwardly from an inner end of the at least one slot to engage a radially outer surface of one of the pipes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A pipe coupling for coupling together two pipes in a fluid-tight manner, comprising:
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an outer tubular casing; an inner tubular casing located concentrically within the outer tubular casing; a tubular sealing sleeve located concentrically within the inner casing and surrounding mutually opposing end portions of the pipes; means for tensioning the outer casing around the inner casing and the sleeve; and the inner and outer casings each having radially inwardly directed and axially-spaced apart end flanges, the tubular sealing sleeve being located between the end flanges of the inner casing, and the end flanges of the outer casing being axially outwardly adjacent the end flanges of the inner casing and providing lateral support therefor. - View Dependent Claims (13, 14, 15)
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16. A pipe coupling for coupling together two pipes in a fluid-tight manner, comprising:
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an outer tubular casing; an inner tubular casing located concentrically within the outer tubular casing; a tubular sealing sleeve located concentrically within the inner tubular casing and surrounding mutually opposing ends of the pipes; means for tightening the outer casing around the inner casing and sealing sleeve; and the inner and outer casings each including radially inwardly projecting and axially-spaced apart end flanges, the sealing sleeve including end seals located between the respective flanges and radially outer surfaces of the pipe ends so that when the tensioning means are tightened, the sealing sleeve is urged into sealing contact with the outer surfaces of the pipe ends and the end seals form seals between the respective flanges and the outer surfaces of the pipe ends. - View Dependent Claims (17)
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18. A pipe coupling for joining together two pipes in a fluid-tight manner, comprising:
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a tubular casing; a tubular sealing sleeve concentrically disposed within the casing and surrounding mutually opposing ends of the pipes; tensioning means for tightening the casing around the sleeve; and the sleeve including two sets of annular radially inwardly projecting sealing ribs on an inner surface of the sleeve which engage the respective pipe ends in a fluid-tight manner, the sealing ribs each being of substantially square profile, the internal diameter of which is equal to the minimum internal diameter of said sealing sleeve, an axially innermost rib of each set being located adjacent the end of the corresponding pipe whereby a portion of the sealing sleeve that is exposed to hydrostatic pressure in the pipes is small compared with the overall length of the sealing sleeve. - View Dependent Claims (19)
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Specification